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Example 14.1: Double-Slit Experiment Suppose in the double-slit arrangement, d =0.150mm, L =120cm, λ=833nm, and y =2.00cm . (a) What is the path difference δ for the rays from the two slits arriving at point P? (b) Express this path difference in terms of λ. (c) Does point P correspond to a maximum, a minimum, or an intermediate condition?
In this section, we study the complications to the double-slit experiment that arise when you also need to take into account the diffraction effect of each slit. To calculate the diffraction pattern for two (or any number of) slits, we need to generalize the method we just used for a single slit.
FORMULA USED: The width ‘d’ of the slit is = 2𝐷𝜆 𝛽 Where ‘d’ = Width of single slit = Width of central maxima. The distance between the first order minima on both side of central maxima. D = Distance between the slit and detector or screen. EXPERIMENT NO.2 OBJECT: To study the Double Slit diffraction and Determine the width of ...
To measure the intensity distribution due to single and double slits and to measure the slit width (d) and slit separation (a). BASIC METHODOLOGY: Light from a He-Ne Laser source is diffracted by single and double slits. The resulting intensity variation is measured by a photo cell whose outputs is read off a current measurement.
EXPLORATION 25.2B – Double-slit geometry. When light of a single wavelength (say, from a laser) is incident on a double slit (or a diffraction grating, which gives a sharper pattern), we get a pattern of bright and dark fringes on a screen beyond the double slit. Such a pattern is shown in Figure 25.6.
To calculate the diffraction pattern for two (or any number of) slits, we need to generalize the method we just used for a single slit. That is, across each slit, we place a uniform distribution of point sources that radiate Huygens wavelets, and then we sum the wavelets from all the slits.
Double Slit Diffraction. Background. Aim of the experiment. Huygens’s principle Interference Fraunhofer and Fresnel diffraction Coherence Laser. To plot the intensity distribution of the Fraunhofer diffraction pattern due to two slits of same width and to estimate the width of the slits and separation between the slits from the intensity pattern.
